Abstract
We report on the results of a de Haas–van Alphen (dHvA) measurement performed on the recently discovered antiferromagnet ( K), a analog of the well studied heavy fermion antiferromagnet . We observe two small Fermi surfaces: a roughly spherical pocket , with kT, and a pillow-shaped closed surface, , with kT. In addition, we observe two higher frequencies with kT and with kT that are seen only near the axis, and that may arise on cylindrical Fermi surfaces. The measured cyclotron masses range from to . A simple LDA+SO calculation performed for the paramagnetic ground state shows a very different Fermi surface topology, demonstrating a need for more advanced electronic structure calculations.
- Received 29 May 2017
- Revised 11 August 2017
DOI:https://doi.org/10.1103/PhysRevB.96.115143
©2017 American Physical Society